Brian Clement, a Florida nutritionist whose controversial treatment of two Canadian First Nations girls with leukemiamade headlines last year, is back giving lectures in Canada and making more contentious health claims.

CBC obtained a recording of a lecture Clement gave in September in Montreal where he said, "Last week, we had somebody at the institute that reversed multiple sclerosis."

Clement 'selling false hope': MS patient

Jonathan Jarry, a scientist and blogger who attended the lecture in Montreal, said Clement spoke for an hour about the benefits of a raw, vegan diet, then did a Q&A with the audience about various medical conditions, including MS.

"I have no respect for people who are selling false hopes to vulnerable individuals who are looking for magical cures, who are looking for any intervention that will help them," Jarry said.

In 2008, Marcia Mundell was diagnosed with a form of MS known as relapsing remitting multiple sclerosis. In 2011, she heard Clement speak at a lecture in Florida.

Marcia Mundell spent over $10,000 at Hippocrates but is still suffering from MS. (CBC)

"I asked him if his plan could help me cure my MS, and he said, 'Absolutely.' "

"He just said if I went to the institution and stayed on the raw food diet and followed their plan, that his program could cure my MS."

Mundell spent over $10,000 at the Hippocrates Health Institute and stayed on the raw, vegan diet Clement recommended for a year, but in 2013, her neurologist said her MS had gotten worse.

Mundell said that while she believes healthy nutrition is beneficial, she would not recommend Hippocrates.

"I think he's giving false hope to people."

'It's not science'

Dr. Mark Freedman, a professor of neurology at the University of Ottawa and director of the multiple sclerosis research unit at the Ottawa Hospital, said he's skeptical of Clement's claims.

"To say that they can reverse deficits that lead to crippling disease — very unbelievable. It's not science."

"Anytime somebody makes a claim you have to ask, where is the evidence? Testimonials, gosh, you could pay a guy on the street to give you a testimonial. You need to have some kind of scientific rigour behind it. Let him do a trial. Let him prove what he is saying."

Clement did not respond to CBC News requests for an interview.

Lecture cancelled

Clement is scheduled to speak this week in B.C. One of those talks was cancelled after CBC made inquiries about it. (Hippocrates Health Institute website)

He was scheduled to speak to children and parents today at an elementary school in Qualicum Beach, B.C. However, after CBC News called to confirm the lecture, school officials said it was cancelled.

"The school was not aware of the controversy surrounding this individual," said Corleen McKinnon-Sanderson, vice-principal of Qualicum Beach Elementary School.

Clement is also scheduled to speak in Parksville, B.C., today and in Courtenay, B.C., tomorrow.